Downgrading is not supported and is likely to cause unpredictable issues (from 31.0.2.1 to 30.0.8.1)

[details=“Support intro”]
Hi, i updated form Shell 30.0.81 to 31.0.2.1
The Update script was fine.

Finished code integrity check
Update successful
Maintenance mode is kept active
Resetting log level

Keep maintenance mode active? [y/N]
Maintenance mode disabled

when i try to access the Website, i get this Message:

Downgrading is not supported and is likely to cause unpredictable issues (from 31.0.2.1 to 30.0.8.1)

but i did not do a downgrade.

nextcloud.log says:

{“reqId”:“K1gvGcGoLsNMVgDBg9OG”,“level”:3,“time”:“2025-03-21T19:00:43+01:00”,“remoteAddr”:“192.168.4.251”,“user”:“–”,“app”:“core”,“method”:“GET”,“url”:“/favicon.ico”,“message”:“Downgrading is not supported and is likely to cause unpredictable issues (from 31.0.2.1 to 30.0.8.1) “,“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:131.0) Gecko/20100101 Firefox/131.0”,“version”:“31.0.2.1”,“data”:{“app”:“core”}}
{“reqId”:“K1gvGcGoLsNMVgDBg9OG”,“level”:3,“time”:“2025-03-21T19:00:43+01:00”,“remoteAddr”:“192.168.4.251”,“user”:”–”,“app”:“core”,“method”:“GET”,“url”:“/favicon.ico”,“message”:“Rendering unthemed error page failed. Falling back to plain text error page.”,“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:131.0) Gecko/20100101 Firefox/131.0”,“version”:“31.0.2.1”,“exception”:{“Exception”:“OCP\HintException”,“Message”:“Downgrading is not supported and is likely to cause unpredictable issues (from 31.0.2.1 to 30.0.8.1)”,“Code”:0,“Trace”:[{“file”:“/var/www/nextcloud/lib/public/Util.php”,“line”:532,“function”:“needUpgrade”,“class”:“OC_Util”,“type”:“::”},{“file”:“/var/www/nextcloud/lib/private/TemplateLayout.php”,“line”:258,“function”:“needUpgrade”,“class”:“OCP\Util”,“type”:“::”},{“file”:“/var/www/nextcloud/lib/private/legacy/OC_Template.php”,“line”:119,“function”:“__construct”,“class”:“OC\TemplateLayout”,“type”:“->”},{“file”:“/var/www/nextcloud/lib/private/Template/Base.php”,“line”:113,“function”:“fetchPage”,“class”:“OC_Template”,“type”:“->”},{“file”:“/var/www/nextcloud/lib/private/legacy/OC_Template.php”,“line”:255,“function”:“printPage”,“class”:“OC\Template\Base”,“type”:“->”},{“file”:“/var/www/nextcloud/index.php”,“line”:35,“function”:“printErrorPage”,“class”:“OC_Template”,“type”:“::”}],“File”:“/var/www/nextcloud/lib/private/legacy/OC_Util.php”,“Line”:1070,“Hint”:“Downgrading is not supported and is likely to cause unpredictable issues (from 31.0.2.1 to 30.0.8.1)”,“message”:“Rendering unthemed error page failed. Falling back to plain text error page.”,“CustomMessage”:“Rendering unthemed error page failed. Falling back to plain text error page.”}}

Who can help me please?

Thanks a lot
Best regards
Tobias

Can you pls use the Support Template

And after that it would be helpfull, what is the content of updater.log and version.php

hi, after rebooting the system, it works fine.

Tanks for help

Tobias